What is Limiting closed port mean?

[Dayve]

Every day I get a email report and it full of these. Do i have something wrong?


Apr 14 13:55:52 freenas kernel: Limiting closed port RST response from 817 to 200 packets/sec
Apr 14 13:55:52 freenas kernel: Limiting closed port RST response from 817 to 200 packets/sec
Apr 14 14:25:52 freenas kernel: Limiting closed port RST response from 576 to 200 packets/sec
Apr 14 14:25:52 freenas kernel: Limiting closed port RST response from 576 to 200 packets/sec
Apr 14 14:55:52 freenas kernel: Limiting closed port RST response from 666 to 200 packets/sec
Apr 14 14:55:52 freenas kernel: Limiting closed port RST response from 666 to 200 packets/sec
Apr 14 15:25:52 freenas kernel: Limiting closed port RST response from 949 to 200 packets/sec
Apr 14 15:25:52 freenas kernel: Limiting closed port RST response from 949 to 200 packets/sec
Apr 14 15:55:54 freenas kernel: Limiting closed port RST response from 783 to 200 packets/sec
Apr 14 15:55:54 freenas kernel: Limiting closed port RST response from 783 to 200 packets/sec
Apr 14 16:25:54 freenas kernel: Limiting closed port RST response from 651 to 200 packets/sec
Apr 14 16:25:54 freenas kernel: Limiting closed port RST response from 651 to 200 packets/sec
Apr 14 16:55:55 freenas kernel: Limiting closed port RST response from 819 to 200 packets/sec
Apr 14 16:55:55 freenas kernel: Limiting closed port RST response from 819 to 200 packets/sec
Apr 14 17:25:53 freenas kernel: Limiting closed port RST response from 776 to 200 packets/sec
Apr 14 17:25:53 freenas kernel: Limiting closed port RST response from 776 to 200 packets/sec
Apr 14 17:55:55 freenas kernel: Limiting closed port RST response from 734 to 200 packets/sec
Apr 14 17:55:55 freenas kernel: Limiting closed port RST response from 734 to 200 packets/sec
Apr 14 18:25:55 freenas kernel: Limiting closed port RST response from 784 to 200 packets/sec
Apr 14 18:25:55 freenas kernel: Limiting closed port RST response from 784 to 200 packets/sec
Apr 14 18:55:57 freenas kernel: Limiting closed port RST response from 772 to 200 packets/sec
Apr 14 18:55:57 freenas kernel: Limiting closed port RST response from 772 to 200 packets/sec

 

[Adrian]

Something is repetitively trying to access a closed port, i.e. one with nothing listening on it.
Has this always happened? If not did you close something down which something might be trying to access?
Some advice in the thread at https://www.ixsystems.com/community/threads/freenas-limiting-closed-port-responses.39945/
If you do use tcpdump, best send the output to a file to avoid tcpdump capturing its own output.